Dual offset bifocal reflector antenna for multibeam earth station

The use of a dual offset bifocal reflector antenna as a small, earth station antenna capable of receiving or transmitting signals to two geostationary satellites is examined. The synthesis procedures for calculating the nodal points and cross section of the bifocal reflector are described; these procedures are applied to the design of a bifocal reflector antenna. The performance of the antenna is analyzed using reflector prediction software. The bifocal reflector is compared to a Cassegrain antenna. It is observed that the bifocal reflector has better scan angles than the Cassegrain antenna and it is efficiently used for scans up to + or - 7 beamwidths.